CN204103752U - A kind of three phase mains filter and power-converting device - Google Patents
A kind of three phase mains filter and power-converting device Download PDFInfo
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- CN204103752U CN204103752U CN201420564503.7U CN201420564503U CN204103752U CN 204103752 U CN204103752 U CN 204103752U CN 201420564503 U CN201420564503 U CN 201420564503U CN 204103752 U CN204103752 U CN 204103752U
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Abstract
The utility model embodiment relates to electronic technology field, particularly relates to a kind of three phase mains filter and power-converting device, changes between ground connection pattern and earth-free pattern for realizing filter.The imaginary neutral point of the first binding post electrical connection filter circuit in the utility model embodiment, first binding post is connected by conductor selectivity with the second binding post of ground connection, thus achieve connection or the disconnection of filter circuit and earth terminal, again owing to having the withstand voltage spacing of setting between the first binding post and the second binding post, and the voltage that the spacing between the first binding post and the second binding post be can bear by filter circuit and earth terminal determines, thus the mode by increasing spacing between the first binding post and the second binding post improves the voltage that can bear between filter circuit and earth terminal, and then realize the voltage that bears between filter circuit and earth terminal higher, the connection of filter circuit and earth terminal or disconnection.
Description
Technical field
The utility model relates to electronic technology field, particularly relates to a kind of three phase mains filter and power-converting device.
Background technology
Usually filter is used to reduce humorous wave interference in high-power electronic device.Filter can carry out effective filtering to characteristic frequency in power line, thus obtains the power supply signal of characteristic frequency.Filter of a great variety, wherein, producing the spectrum component of interference, strengthening the Electro Magnetic Compatibility of frequency converter to electrical network and other digital electronic device when frequency converter special filter is for eliminating frequency converter work.
Equipment ground refers to that equipment is connected with ground wire.In theory, the earth terminal resistance to earth value of equipment and magnitude of voltage are zero.Filter needs ground connection under application-specific scene, so that the hf interference current in circuit is imported ground wire, increases the filter effect of filter further.Under other special scenes, the interference in the earth can be introduced circuit by filter ground connection on the contrary, and then increases interference.Therefore, because application scenarios is different, filter need switch between ground connection pattern and earth-free pattern.
Therefore, needing a kind of three phase mains filter and power-converting device badly, changing between ground connection pattern and earth-free pattern for realizing filter.
Utility model content
The utility model embodiment provides a kind of three phase mains filter and power-converting device, changes between ground connection pattern and earth-free pattern in order to realize filter.
The utility model provides a kind of three phase mains filter, comprise: filter circuit, the first binding post, and second binding post, the imaginary neutral point of the first binding post electrical connection filter circuit, and be connected by conductor selectivity with the second binding post of ground connection, there is between the first binding post and the second binding post the withstand voltage spacing of setting.
In the utility model embodiment, due to the imaginary neutral point of the first binding post electrical connection filter circuit, the first binding post is connected by conductor selectivity with the second binding post of ground connection, thus achieves connection or the disconnection of filter circuit and earth terminal.
Owing to having the withstand voltage spacing of setting between the first binding post and the second binding post, and the voltage that the spacing between the first binding post and the second binding post be can bear by filter circuit and earth terminal determines, thus the mode by increasing spacing between the first binding post and the second binding post improves the voltage that can bear between filter circuit and earth terminal, and then realize the voltage that bears between filter circuit and earth terminal higher, the connection of filter circuit and earth terminal or disconnection.
The conductor connecting the first binding post and the second binding post in the three phase mains filter that the utility model embodiment provides is the lead-in wire with conducting function, one of having in the first end of the lead-in wire of conducting function and the first binding post and the second binding post removably connects, and the second end and the first binding post are fixedly connected with another in the second binding post.The method is simple to operate, and when the first end that goes between is in off-state, the second end of lead-in wire is still in stationary state, therefore can prevent lead-in wire from losing in the course of the work.
The three phase mains filter that the utility model embodiment provides also comprises filter substrate, filter circuit can be arranged in filter substrate, and is welded in filter substrate by the first binding post.Filter circuit and the first binding post reasonably can be arranged by filter substrate.
When three phase mains filter needs to be in earth-free pattern, the first end with the lead-in wire of conducting function needs to disconnect with the first binding post or the second binding post, the first end that now goes between is in vacant state, in circuit, in order to the first end that anchor leg is unsettled, the three phase mains filter that the utility model provides also comprises the 3rd binding post, can removably connect with the first end of the lead-in wire with conducting function.Preferably, the 3rd binding post can be welded in filter substrate.
The three phase mains filter that the utility model embodiment provides, filter circuit is formed by multiple electric capacity and/or inductance connection in series-parallel.
Based on above-mentioned three phase mains filter, the utility model embodiment still provides a kind of power-converting device, comprise above-mentioned three phase mains filter, and the second binding post of three phase mains filter is fixed on the casing of power-converting device, and connects the earth connection of power-converting device.Preferably, the power-converting device that the utility model embodiment provides is frequency converter.Those skilled in the art are known, and the circuit of power-converting device can be the combination of frequency converter, rectifier, rectifier and inverter, and some other power-converting device circuit.
In the utility model embodiment, the imaginary neutral point of the first binding post electrical connection filter circuit, first binding post is connected by conductor selectivity with the second binding post of ground connection, thus achieve connection or the disconnection of filter circuit and earth terminal, again owing to having the withstand voltage spacing of setting between the first binding post and the second binding post, and the voltage that the spacing between the first binding post and the second binding post be can bear by filter circuit and earth terminal determines, thus the mode by increasing spacing between the first binding post and the second binding post improves the voltage that can bear between filter circuit and earth terminal, and then realize the voltage that bears between filter circuit and earth terminal higher, the connection of filter circuit and earth terminal or disconnection.
Accompanying drawing explanation
A kind of power-converting device external structure schematic diagram that Fig. 1 is suitable for by the utility model embodiment;
Fig. 2 provides a kind of schematic diagram of power-converting device for the utility model embodiment;
The another kind of filter circuit schematic diagram that Fig. 3 provides for the utility model embodiment;
The another kind of filter circuit schematic diagram that Fig. 4 provides for the utility model embodiment;
Fig. 5 is the schematic diagram arranging switch in prior art in filter;
The schematic diagram of the another kind of three phase mains filter that Fig. 6 provides for the utility model embodiment;
The schematic diagram of the another kind of three phase mains filter that Fig. 7 provides for the utility model embodiment;
The schematic diagram of the another kind of three phase mains filter that Fig. 8 provides for the utility model embodiment.
Embodiment
In order to realize filter flexible conversion between ground connection pattern and earth-free pattern, the utility model provides a kind of three phase mains filter, and further, based on this three phase mains filter, the utility model additionally provides a kind of power-converting device.
In order to make the purpose of this utility model, technical scheme and beneficial effect better clear, further combined with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
In the utility model embodiment, the three-phase in three phase mains represents with R, S, T, and wherein, R represents first-phase, and S represents second-phase, and T represents third phase.
As shown in Figure 1, Fig. 1 schematically illustrates a kind of power-converting device, the contour structures schematic diagram of such as frequency converter, the housing of the power-converting device shown in Fig. 1 can comprise two parts, place frequency converter in the first larger casing 101, in the second less casing 102, place three phase mains filter.Assemble in demountable mode between first casing 101 and the second casing 102.When needing three phase mains filter to carry out the switching of ground connection pattern and earth-free pattern, the lid of the second less casing 102 is only needed to open, three phase mains filter is carried out to the switching of ground connection pattern and earth-free pattern, this process does not need the second casing 101 of mobile frequency converter, simple to operation.If the mains side of power-converting device does not need to carry out filtering, then do not need the second casing 102.
Although be introduced for the frequency converter profile comprising three phase mains filter shown in Fig. 1, those skilled in the art are known, the power-converting device comprising three phase mains filter provided by the utility model also can adopt the structure be different from shown in Fig. 1, such as, only can have a casing or casing is not shape as shown in Figure 1.
As shown in Figure 2, the schematic diagram of a kind of power-converting device that the utility model embodiment provides, comprise three phase mains filter 202 provided by the utility model and power transformation circuit 203, power-converting device 2101 connects three-phase power input end 201, three phase mains filter can carry out filtering to the three phase mains of any load, three phase mains filter comprises filter circuit, and the output of filter circuit is connected with the input of the power transformation circuit in power-converting device usually.Those skilled in the art are known, and the circuit of power-converting device can be the combination of frequency converter, rectifier, rectifier and inverter, and some other power-converting device circuit.It should be noted that in power-converting device except three phase mains filter 202 and power transformation circuit 203, to also have other to form, understand embodiment of the present utility model owing to not affecting, do not illustrate one by one in various figures.
When the circuit of power-converting device is frequency converter, three phase mains filter 202 is contained between three-phase power input end 201 and frequency converter, so that when eliminating frequency converter work, electrical network and other digital electronic device are produced to the spectrum component of interference, strengthen the Electro Magnetic Compatibility of frequency converter.Three phase mains filter allows the electric current of useful signal to pass through, and the interference signal higher to frequency then has larger decay.Filter circuit in the three phase mains filter that frequency converter is special can be made up of electric capacity, inductance.Filter circuit is formed by multiple electric capacity and/or inductance connection in series-parallel.Those skilled in the art are known, and the circuit of power-converting device is the combination of rectifier, rectifier and inverter, and during some other power-converting device circuit, three phase mains filter can do corresponding change.
In concrete enforcement, this three phase mains filter can be arranged in filter substrate, thus simplify the installation and removal of three phase mains filter.
In concrete enforcement, usual power transformation circuit 203 needs ground connection, therefore preferably, can be fixed on the casing of power-converting device 203 by the second binding post 208 of three phase mains filter 202, and connect the earth connection of power-converting device 203, as shown in Figure 2.Now three phase mains filter 202 shares an earth connection with power transformation circuit 203, decreases circuit complexity, optimized circuit layout.
In the embodiment of power-converting device provided by the utility model, the imaginary neutral point of the first binding post electrical connection filter circuit of the three phase mains filter included by power-converting device, first binding post is connected by conductor selectivity with the second binding post of ground connection, thus achieve connection or the disconnection of filter circuit and earth terminal, again owing to having the withstand voltage spacing of setting between the first binding post and the second binding post, and the voltage that the spacing between the first binding post and the second binding post be can bear by filter circuit and earth terminal determines, thus the mode by increasing spacing between the first binding post and the second binding post improves the voltage that can bear between filter circuit and earth terminal, and then realize the voltage that bears between filter circuit and earth terminal higher, filter circuit in power-converting device and the connection of earth terminal or disconnection.
Power transformation circuit in above-mentioned power-converting device can be optional by user, three phase mains filter 202 in above-mentioned power-converting device provides for the utility model embodiment, based on identical design, below the three phase mains filter 202 that the utility model embodiment provides is described in detail.
As shown in Figure 2, three phase mains filter 202 is generally contained in three phase mains input side, such as, be connected on three-phase power input end 201, three phase mains supplies power transformation circuit 203 after filtering, and the output of power transformation circuit 203 connects load.Three phase mains filter 202 can carry out effective filtering to the frequency beyond the frequency of characteristic frequency in power line or this frequency, obtains the power supply signal of a characteristic frequency, or eliminates the power supply signal after a characteristic frequency.
This three phase mains filter 202 is between three-phase power input end 201 and power transformation circuit 2101, and three-phase power input end 201 is respectively R, S, T.Preferably, three phase mains filter can be arranged in filter substrate, thus simplify the installation and removal of three phase mains filter.
In fig. 2, three phase mains filter 202 comprises filter circuit 204.Filter circuit 204 can be made up of multiple electric capacity 205.Those skilled in the art are known, and filter circuit is made up of electronic device connection in series-parallel such as electric capacity, inductance and resistance usually, but also can by other electronic device composition form, and Fig. 3, Fig. 4 respectively illustrate the structure of several filter circuit.Filter circuit 302 in Fig. 3 between three-phase power input end 301 and power transformation circuit 303 is made up of multiple electric capacity 305 and multiple inductance 304, and inductance 304 can be connected in circuit, multiple electric capacity 305 can parallel connection in circuit.Filter circuit 402 in Fig. 4 between three-phase power input end 401 and power transformation circuit 403 is made up of multiple inductance 404, electric capacity 405, resistance 406, inductance 404 can be connected in circuit, electric capacity 405 can parallel connection in circuit, resistance 406 can with Capacitance parallel connection.Those skilled in the art are known, all have an imaginary neutral point in filter circuit, such as, in order to connect three branch roads of three phase mains, the imaginary neutral point 407 in the imaginary neutral point 306, Fig. 4 in the imaginary neutral point 206, Fig. 3 in Fig. 2.When filter circuit is in ground connection pattern, need imaginary neutral ground.
As shown in Figure 2, in order to realize the conversion of three phase mains filter 202 between ground connection pattern and earth-free pattern, the utility model is provided in imaginary neutral point 206 place and is electrically connected the first binding post 207, first binding post is drawn by imaginary neutral point 206, can be connected by conductor with the second binding post 208 of ground connection.
When first binding post 207 being connected with the second binding post 208 by conductor 210, namely three phase mains filter 202 is in ground connection pattern, when the first binding post 207 and the second binding post 208 disconnect, namely three phase mains filter 202 is in earth-free pattern.Can find out, the three phase mains filter 202 that the utility model embodiment provides is connected by the selectivity of conductor 210, be turned on or off the first binding post 207 and the second binding post 208, thus realizing the switching of filter circuit 204 between ground connection pattern and earth-free pattern, the method is simple to operate.
Preferably, first binding post 207 is fixed in filter substrate by welding manner, the mode of the first binding post 207 also by being threaded is fixed in filter substrate, and the first binding post 207 is not limited to aforesaid way with the mode that is fixedly connected with between filter substrate.
Further, according to UL508C agreement, distance between first binding post 207 and the second binding post 208 and the voltage that can bear between the first binding post 207 and the second binding post 208 have relation, and due in agreement between regulation three phase mains filter 202 and earth terminal 209 needed for the voltage that bears be standard value, the distance therefore between the first binding post 207 and the second binding post 208 is also standard value.The withstand voltage spacing of setting is provided between the first binding post 207 and the second binding post 208 in the three phase mains filter 202 provided in the utility model, by adjusting this withstand voltage spacing flexibly, adapt to the different withstand voltages that can bear between three phase mains filter 202 from earth terminal 209.
In prior art, when the voltage of three phase mains filter and earth terminal is less, as 250V, electromagnetic switch can be used to realize the switching of three phase mains filter between ground connection pattern and earth-free pattern, when the voltage of three phase mains filter and earth terminal is larger, during as 25000V, then circuit breaker can be used to realize the switching of three phase mains filter between ground connection pattern and earth-free pattern.When the voltage born of three phase mains filter and earth terminal is kilovolt rank, during as 2500V, if still use electromagnetic switch to carry out the switching of implement device between ground connection pattern and earth-free pattern, then can cause the following problem.
Fig. 5 shows the schematic diagram arranging electromagnetic switch in three phase mains filter, as shown in Figure 5, switchblade knife 510 promotes to stiff end 512, first make contact 507 and the second contact point 508 conducting, now electromagnetic switch is then in closure state, because the second contact point 508 is connected with earth terminal 509, therefore, when first make contact 507 and the second contact point 508 conducting, this three phase mains filter 502 is in ground connection pattern.Three phase mains filter 502 is relevant to the distance between first make contact in the voltage that earth terminal 509 can bear and switch 507 and the second contact point 508, when the voltage that three phase mains filter 502 and earth terminal 509 can bear is 2500V, need to increase the withstand voltage spacing between first make contact 507 and the second contact point 508, this ordinary tap overall volume now can be caused to increase, but the enclosure volume of placing three phase mains filter 502 in prior art is less, this ordinary tap then can cause putting to enter in the shell of three phase mains filter 502 comparatively greatly, if whole for three phase mains filter 502 enclosure volume is increased, three phase mains filter 502 then can be caused incompatible with the size of miscellaneous equipment of the prior art.If this ordinary tap volume is reduced, then owing to requiring that this ordinary tap needs other voltage of resistance to KV level, therefore cause this ordinary tap price high, and then cause the cost of three phase mains filter greatly to improve, for the sale of product and use cause great obstacle.
And in the utility model embodiment, directly realize being electrically connected by conductor between first binding post with the second binding post, therefore, withstand voltage distance between first binding post and the second binding post can arrange according to the second enclosure interior space neatly, can not be subject to the impact of switch element volume.Generally, the second binding post can be fixed on the second housing easily, and is electrically connected with the terminals of frequency converter.When the voltage that three phase mains filter and earth terminal can bear is 2500V, three phase mains filter provided by the utility model can well be used, namely easy to use, save cost again, the magnitude of voltage that can also can bear according to three phase mains filter and earth terminal determines the withstand voltage spacing between the first binding post and the second binding post.
In a kind of specific embodiment, the conductor in the filter in embodiment provided by the utility model is the lead-in wire with conducting function, and this conductor also can be the circuit element that other has conducting function.Preferably, of having in the first end of the lead-in wire of conducting function and the first binding post and the second binding post removably connects, and the second end and the first binding post are fixedly connected with another in the second binding post.Preferably, be detachably connected as contact pin and connect, now, conductor is that the first end that removably connects should be provided with sheath, by the plug of sheath with contact pin, and the connection of realize going between first end and the first binding post and disconnection.Contact pin connection occupies little space, handled easily, and connects reliable.Removably connect also to can be and be threaded.Preferably, be fixedly connected with and can be welding manner.
Fig. 2, Fig. 6, Fig. 7 show schematically the example that several conductor connects the first binding post and the second binding post.As shown in Figure 2, when conductor 210 is for lead-in wire, lead-in wire first end and the first binding post 207 are for removably connecting, second end and the second binding post 208 are for being fixedly connected with, now the first binding post 207 should be set to contact pin form, and the first end of the lead-in wire be connected with the first binding post 207 should arrange the sheath 211 supporting with the contact pin of the first binding post 207.Lead-in wire second end and the second binding post 208 can be welded together in Fig. 2.
As shown in Figure 6, the imaginary neutral point 603 of the filter circuit 602 in three phase mains filter 601 is electrically connected the first binding post 604, second binding post 605 connects earth terminal 606, the first end of lead-in wire 607 and the second binding post 605 are for removably connecting, therefore the second binding post 605 is contact pin form, and the first end of lead-in wire 607 is provided with sheath 608.Lead-in wire 607 the second end with the first binding post 604 for being fixedly connected with.
Those skilled in the art are known, when go between first end and the first binding post are off state, due to second end that goes between with the second binding post for being fixedly connected with, therefore can prevent from going between and lose in the course of the work.
In another kind of implementation, as shown in Figure 7, the imaginary neutral point 703 of the filter circuit 702 in three phase mains filter 701 is electrically connected the first binding post 704, second binding post 705 connects earth terminal 706, one end of lead-in wire 707 and the first binding post 704 are for removably connecting, the other end of lead-in wire 707 and the second binding post 705 are also for removably connecting, therefore the first binding post 704 and the second binding post 705 are contact pin form, and the two ends of lead-in wire 707 are provided with sheath 708.
When three phase mains filter needs to be in earth-free pattern, the first end with the lead-in wire of conducting function needs to disconnect with the first binding post or the second binding post, the first end that now goes between is in vacant state, in circuit, in order to the first end that anchor leg is unsettled, the three phase mains filter that the utility model provides also arranges the 3rd binding post.As shown in Figure 2, the 3rd binding post 212 can removably connect with the first end of the lead-in wire with conducting function.When lead-in wire first end and the first binding post 207 disconnect, be connected with the 3rd binding post 212, connection diagram as shown in Figure 8,3rd binding post 212 is not connected into any circuit, also earth-free, therefore when the first end that goes between is connected with the 3rd binding post 212, the 3rd binding post only plays the effect of anchor leg first end, and due to the first binding post 207 unsettled, now filter circuit 204 is in earth-free pattern.
Three phase mains filter is arranged in filter substrate usually, and preferably, be fixed in filter substrate by the first binding post 207, the second binding post 208 can be fixed on casing.Preferably, the 3rd binding post 212 can be fixed on substrate, also can be fixed on casing.Fixed form can be welding.
Known by above-mentioned discussion, in the embodiment of three phase mains filter provided by the utility model, the imaginary neutral point of the first binding post electrical connection filter circuit, first binding post is connected by conductor selectivity with the second binding post of ground connection, thus achieve connection or the disconnection of filter circuit and earth terminal, again owing to having the withstand voltage spacing of setting between the first binding post and the second binding post, and the voltage that the spacing between the first binding post and the second binding post be can bear by filter circuit and earth terminal determines, thus the mode by increasing spacing between the first binding post and the second binding post improves the voltage that can bear between filter circuit and earth terminal, and then realize the voltage that bears between filter circuit and earth terminal higher, the connection of filter circuit and earth terminal or disconnection.
Although described preferred embodiment of the present utility model, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the utility model scope.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.
Claims (9)
1. a three phase mains filter, is characterized in that, comprising:
Filter circuit;
First binding post, described first binding post is electrically connected the imaginary neutral point of described filter circuit, and is connected by conductor selectivity with the second binding post of ground connection, has the withstand voltage spacing of setting between described first binding post and the second binding post.
2. three phase mains filter as claimed in claim 1, it is characterized in that, described conductor is the lead-in wire with conducting function, described there is the lead-in wire of conducting function first end and described first binding post and the second binding post in one removably connect, the second end and described first binding post are fixedly connected with another in the second binding post.
3. three phase mains filter as claimed in claim 1 or 2, it is characterized in that, also comprise filter substrate, described filter circuit is arranged in described filter substrate, and described first binding post is welded in described filter substrate.
4. three phase mains filter as claimed in claim 3, is characterized in that, also comprise the 3rd binding post, can removably connect with the described first end with the lead-in wire of conducting function.
5. three phase mains filter as claimed in claim 4, is characterized in that, described in be detachably connected as contact pin and connect.
6. three phase mains filter as claimed in claim 5, it is characterized in that, described 3rd binding post is welded in described filter substrate.
7. three phase mains filter as claimed in claim 1, is characterized in that, described filter circuit is formed by multiple electric capacity and/or inductance connection in series-parallel.
8. a power-converting device, it is characterized in that, comprise the three phase mains filter any one of claim 1 to 7 as described in claim, described second binding post is fixed on the casing of described power-converting device, and connects the earth connection of described power-converting device.
9. power-converting device as claimed in claim 8, it is characterized in that, described power-converting device is frequency converter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420564503.7U CN204103752U (en) | 2014-09-28 | 2014-09-28 | A kind of three phase mains filter and power-converting device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420564503.7U CN204103752U (en) | 2014-09-28 | 2014-09-28 | A kind of three phase mains filter and power-converting device |
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| CN204103752U true CN204103752U (en) | 2015-01-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743334A (en) * | 2016-03-29 | 2016-07-06 | 上海中科深江电动车辆有限公司 | Filtering circuit of low-voltage power supply loop |
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2014
- 2014-09-28 CN CN201420564503.7U patent/CN204103752U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743334A (en) * | 2016-03-29 | 2016-07-06 | 上海中科深江电动车辆有限公司 | Filtering circuit of low-voltage power supply loop |
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